{"id":4182,"date":"2011-08-26T14:19:06","date_gmt":"2011-08-26T21:19:06","guid":{"rendered":"http:\/\/cafe.foundation\/blog\/?p=4182"},"modified":"2011-08-26T14:25:17","modified_gmt":"2011-08-26T21:25:17","slug":"embry-riddle-begins-gfc-test-flights","status":"publish","type":"post","link":"http:\/\/cafe.foundation\/blog\/embry-riddle-begins-gfc-test-flights\/","title":{"rendered":"Embry Riddle Begins GFC Test Flights"},"content":{"rendered":"

On August 23, 2011, the Embry Riddle Aeronautical University\u2019s Green Flight Challenge hybrid-powered modified Stemme S10, the Eco-Eagle, began its ground tests on the Daytona Beach International taxiways, \u201cGetting ATC used to us!\u201d\u00a0 \u00a0The next day saw several ground-skimming \u201cflights,\u201d starting at 2-feet, and rising to 10 and 50-feet high runs, all with the gear down.\u00a0 The day\u2019s flights ended with a trip around the pattern for the airport\u2019s longest runway.<\/p>\n

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Embry Riddle's Eco-Eagle on August 24 test hop<\/p><\/div>\n

August 25 saw a morning excursion of 45 minutes, with the airplane flying in the face of the approaching Hurricane Irene.\u00a0 Test pilot Mikhael Ponso reported beautiful clouds and no high winds during the seven laps around the field.\u00a0 As he tested the gear retraction and various flap settings, he was able to sort things out for the upcoming GFC flights in Santa Rosa, California during the last week in September.<\/p>\n

The school\u2019s Eco-Eagle has a Rotax hybrid-power system originally developed for Flight Design, a German firm that builds the CT Light Sport Aircraft.\u00a0 In the competition, it will take off on its gasoline-powered 100-horsepower Rotax 912 four-cylinder engine for best rate of climb, then switch to the 40-horsepower battery-powered electric motor to \u201cfly as much of the course as possible,\u201d according to Ponso.<\/p>\n

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ERAU's Rotax hybrid on its first test stand runup<\/p><\/div>\n

ERAU\u2019s Eco-Eagle team <\/a>originally intended to use Swift bio-fuels in their GFC flight, but rule changes caused them to rethink that strategy, which would have given them an advantage in the bio-fuel and electric drive areas.\u00a0 Eco-Eagle\u2019s Rotax will run on 100 octane low-lead aviation gas instead.\u00a0 As a side note, Embry Riddle is testing Swift fuels in their training fleet, emphasizing the school\u2019s commitment to achieving green flight in everyday operations.<\/p>\n

An MT controllable-pitch propeller replaces the Stemme\u2019s original unique folding propulsor, which tucked into the sliding nose cone to allow laminar flow over the forward fuselage.\u00a0 The nose cone will remain open throughout all operations, since the larger MT propeller has no folding mechanism \u2013 and wouldn\u2019t fit anyway.<\/p>\n

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Mikhel Ponso (left) Nate Rich on early gear retraction test, checking for possible battery space in wheel wells<\/p><\/div>\n

A specially-designed clutch on the Rotax\/motor setup allows switching from IC to electric power with a hoped-for minimum of fuss.\u00a0 As explained on the Eagle Flight Research Center web site, \u201cA poly-V belt system couples the electric motor to the Rotax engine.\u00a0 An overrunning clutch is installed to allow the engine to operate without the electric motor for takeoff and climb, and the electric motor to be operated without the Rotax engine during cruise flight.\u00a0 Since the engine in the Eco-Eagle is mounted behind the occupants, a driveshaft connects the engine to a belt reduction system and the propeller at the front of the aircraft.\u201d<\/p>\n

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September 2010 shot of Lori Costello, Eco-Eagle Team Leader and Mikhael Ponso, test pilot in unmodified S10<\/p><\/div>\n

The sailplane\u2019s 50:1 lift-to-drag ratio should enable the craft to slip along with minimum power, stretching the endurance of the 200 pounds of lithium batteries on board.<\/p>\n

It\u2019s exciting to see so many smart and enthusiastic young people involved in this project.\u00a0\u00a0 We wish them the best in the Green Flight Challenge.<\/p>\n

Many thanks to Shirley Koelker, Lori Costello and Mikhael Ponso for information used in this entry.<\/p>\n